Punch press

ABSTRACT

A punch press, especially for punching holes into small angle profiles, which is provided with a sleeve partly arranged in the press frame, the sleeve basically having a round cross section and being rotatable about its longitudinal axis. The sleeve has at least on one side thereof a section decreasing in diameter and has adjacent sleeve sections reciprocably guided in a bore provided in the punch press frame and open along one side of said frame so as selectively to allow removal of the sleeve therethrough.

States Patent [191 Stursberg PUNCH PRESS [75] Inventor: Bernd-H. Stursberg, Ennepetal,

Germany [73] Assignee: Paul Ferd. Peddinghaus,

Gevelsberg, Germany [22] Filed: July 6, 1972 [21] Appl. No.: 269,307

[52] US. Cl 83/635, 83/698, 83/821, 279/1 R, 279/1 B, 279/91 [51] Int. Cl B26d 5/08, B23b 29/04 [58] Field of Search 83/698, 571, 821, 83/926 G, 635; 279/8, 89, 90, 91, 1 TS, l A,

l B, 1 R

[56] References Cited UNITED STATES PATENTS 6/1931 Hallings 83/635 4/1964 Smeets 83/571 X 3,719,117 3/1973 Mauk eral 83/693 3,053,368 9/1962 Klahn 279/89 UX 770,239 9/1904 Lovejoy 83/698 X Primary Examiner--Andrew R. Juhasz Assistant Examiner-James F. Coan Att0rney-Walter Becker [57] ABSTRACT A punch press, especially for punching holes into small angle profiles, which is provided with a sleeve partly arranged in the press frame, the sleeve basically having a round cross section and being rotatable about its longitudinal axis. The sleeve has at least on one side thereof a section decreasing in diameter and has adjacent sleeve sections reciprocably guided in a bore provided in the punch press frame and open along one side of said frame so as selectively to allow removal of the sleeve therethrough.

12 Claims, 6 Drawing Figures PATENTED W 91975 SHEET 1!]? 2 PATENTED BET. 91975 sum 2 or 2 Fig.3

PUNCH PRESS The present invention relates to a punch press, especially for punching holes in small angle profiles, with a punch sleeve partially receiving the punch.

For punching, especially small angle profiles, it is important that the punch bore can be provided in the vicinity of the second vertically upwardly extending profile leg. The smaller the angle profile, the thinner is in most instances the punch which will require holding means in the form of a punch sleeve. Such punch sleeve, however, must not be too thick inasmuch as otherwise the distance of the punched hole from the vertical profile leg will become undesirably great.

In the machine tool art, for instance with drilling and milling machines, it is known to guide the drilling spindle in a supporting sleeve so that the drilling spindle with a larger working range will be properly supported. It is furthermore known to support the rotating spindle of such machine tools by a fixed supporting bearing which may be done, for instance, by means of a lower arm.

It is an object of the present invention to provide a punch press of the above described general character by means of which it will be possible to provide in particular small angle profiles with punched bores or holes.

This object and other objects and advantages of the invention will appear more clearly from the following specification in con-nection with the accompanyin drawings, in which:

FIG. 1 illustrates a side view of the most important parts of the punch press according to the invention.

FIG. 2 is a front view of the structure shown in FIG. 1.

F IG. 3 represents a cross section taken along the line Ill III of FIG. 1.

FIG. 4 represents a section taken along the line IV IV of FIG. 1.

FIGS. 5 and 6 respectively illustrate different embodiments of punch sleeves and punches according to the invention.

The punch press according to the present invention is characterized primarily in that the punch sleeve which has a round cross section is rotatable about its longitudinal axis and over a portion of its length is at least on one side thereof provided with a section which is reduced in cross section and has its cross sectional portions adjacent the last mentioned section guided in a unilaterally open bore of the punch press frame.

The invention is based on the general idea so to design the guiding or punch press sleeve for the punch that, on one hand, the sleeve can be exchanged for another one so that it can not only be used in connection with different punches but that, on the other hand, different distances of the punched holes from the vertically upwardly extending leg of an angle profile can be coped with.

By the guiding means in a portion of the frame, the sleeve itself is held in place and guided so that with a constant cross section of the bore of the punch press frame, it is possible to employ punches of different thicknesses.

According to a further development of the invention, that section of the punch sleeve which is reduced in cross section may be stepped or may be inclined.

Furthermore, that section of the punch sleeve which has the reduced cross section may be defined by a plane wall. This plane wall may have associated therewith a second plane wall so that the section of reduced cross section will be defined by two parallel longitudinal walls.

According to a further development of the punch press according to the invention, the punch sleeve is held in a manner known per se to the punch press frame by a box nut. If the punch is oval, it will be connected in a non-rotatable manner to the punch head while the box nut of the punch sleeve in which the punch is held in longitudinal direction retains the sleeve as well as the punch at their respective heights.

According to a still further feature of the invention, the punch press frame is provided with an arm which extends into the range of the punch and comprises a guilding bore for the punch sleeve. The upper end of this arm is spaced from the frame head and comprises the unilateral opening for exchanging the sleeve. The frame arm of the punch press may also be provided with steps or with an inclined surface which as to their location correspond to that of the sleeve step or inclined surface of the sleeve. Also the step or inclined surface of the frame arm is intended to permit the provision of the punch bore as close to the vertically upwardly directed leg of small angle profiles while the punch is held by the punch sleeve and the punch sleeve is guided in the frame arm.

Referring now to the drawings in detail, the punch press head 2 is reciprocably guided upwardly and downwardly in the punch press frame 1. The head 2 is in the vicity of its lower end provided with a thread 3 below which the transition and abutment member 4 is provided. The member 4 has a transverse slot 5 into which a transverse key 6 may be arranged when employing an oval punch. Key 6 extends into a groove 7 of the punch 8, but it is superfluous when employing a round punch.

A box nut 9 is screwed onto the thread 3 of the punch press head 2. The lower portion 10 of nut 9 extends around the upper portion of a punch sleeve 11 and holds the same. The punch sleeve 11 is so designed that its inner bore positively receives the punch 8 or an upper intermediate member which in its turn abuts the punch which latter engages a corresponding shoulder of the inner bore of the sleeve. Thus, with the embodiment of FIG. 5, an intermediate member 12 is provided in sleeve 11 which intermediate member has its lower end in engagement with the punch 13 while the punch 13 rests upon the shoulder 14 of bore 15 in sleeve 11.

With the embodiment of FIG. 6, the sleeve receives a part 16 with a cylindrical extension 17 which latter rests in a bore 18 of sleeve 1 1. The small punch 20 rests against the part 16 which is held in bore 19.

The punch press frame comprises a frame arm 21 arranged in spaced relationship to the section la of the punch frame. Arm 21 extends into the region of the punch sleeve 11 and has a bore 22 with a unilateral opening 23. The end face wall 25 of arm 21 may merge with an arched wall 26 or may have a step whereby the widened opening 24 is formed. (FIG.2).

As will be seen from FIG. 3, sleeve 11 may have a uniform confining wall 27 which extends approximately over the entire length of the sleeve. By means of this wall 27, the cross section of the sleeve is reduced while the cross sectional portions 27a, 27b at both sides meet this wall 27. This wall 27, may however, similar to the confining wall 25 of arm 21, be arched in downward direction or may be stepped. The confining wall 27 may have associated therewith a parallel wall 28 (FIGS. 3 and 4) so that a sleeve 11 is formed which is on both sides flattened as to its cross section.

The sleeve 11 is guided in bore 22 of arm 21 by means of its cross sectional portions 27a, 27b. Inasmuch as the sleeve is rotatable about its longitudinal axis L, it can be withdrawn from the opening 23 by turning it about an angle of 90 after the box nut 9 has been loosened and has been lowered onto the arm 21 of frame 1.

After the punch sleeve and the punch head have been removed from the punch press, it is possible to insert into the supporting arm a new punch sleeve with a different punch, whereupon the box nut 19 is again tightened so that the head 2 is again connected to the punch sleeve 11 and the punch. As will be evident from FIG. 1, it is possible, in view of the design and arrangement of the punch sleeve 11 and of the frame arm 21 to provide a punch hole or bore in the immediate vicinity of the vertical leg Sch of an angle profile W while the punch has associated therewith exchangeable guiding means.

As will be seen from FIGS. 1 and 2, the lower end 21a of the punch frame 21 extends close to the matrix M. Preferably, the distance between the two parts is only slightly greater than the thickness of the work piece W so that the frame arm 21 will simultaneously be able to operate as stripper.

As will also be evident from FIGS. 1 and 2, the lower end 11a of the punch sleeve 11 is spaced from the punch end 8a by the distance x which corresponds approximately to the lifting height of the punch 8 so that also an optimum guiding of the punch over its length in the sleeve 11 will be assured.

It is, of course, to be understood that the present invention is, by no means, limited to the particular showing in the drawings, but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. A punch press having a frame section with a guiding bore therethrough which bore has an opening arranged unilaterally along a side thereof and extends in the longitudinal direction of the axis of said bore, said bore being accessible from the outside through said opening, a guiding sleeve reciprocably guided in said guiding bore and selectively removable from said bore through said opening, said sleeve having at least over a portion of its length and at least at one side of said sleeve a reduced cross section permitting removal of said sleeve from said bore through said opening upon angularly turning said sleeve in said bore, said sleeve having an axial bore for positively receiving a punch.

2. A punch press according to claim 1, in which said sleeve at its portion of reduced cross section decreases in diameter in steps.

3. A punch press according to claim 1, in which said sleeve at its portion of reduced cross section tapers gradually.

4. A punch press according to claim 1, in which said sleeve has its portion of reduced cross section partially defined by a straight wall surface and partially by a round wall surface.

5. A punch press according to claim 1, in which said sleeve has its portion of reduced cross section partially defined by two oppositely located straight wall surface portions and two oppositely located curved wall surface portions respectively located between said straight wall surface portions.

6. A punch press according to claim 1, which includes a press head and also includes box means connecting said sleeve to said press head.

7. A punch press according to claim 1, which includes a frame head and in which said frame section is formed by an arm vertically spaced from said frame head.

8. A punch press according to claim 7, in which said sleeve at its portion of reduced cross section decreases in diameter in steps and in which said arm has a stepped surface section corresponding to the steps at the reduced diameter section of said sleeve.

9. A punch press according to claim 7, in which said sleeve at its portion of reduced cross section tapers gradually, and in which said arm is provided with a surface section tapering in conformity with the taper of said reduced cross section.

10. A punch press according to claim 7, which includes a matrix receiving portion, and in which the lower end of said arm extends near to said matrix receiving portion.

11. A punch press according to claim 10, in which the distance between said arm and said matrix receiving portion approximately equals the thickness of the workpiece to be punched.

12. A punch press according to claim 1, which includes a punch arranged within said sleeve and protruding from the lower end thereof by a distance approximately equalling the lifting stroke of said punch. II *0 

1. A punch press having a frame section with a guiding bore therethrough which bore has an opening arranged unilaterally along a side thereof and extends in the longitudinal direction of the axis of said bore, said bore being accessible from the outside through said opening, a guiding sleeve reciprocably guided in said guiding bore and selectively removable from said bore through said opening, said sleeve having at least over a portion of its length and at least at one side of said sleeve a reduced cross section permitting removal of said sleeve from said bore through said opening upon angularly turning said sleeve in said bore, said sleeve having an axial bore for positively receiving a punch.
 2. A punch press according to claim 1, in which said sleeve at its portion of reduced cross section decreases in diameter in steps.
 3. A punch press according to claim 1, in which said sleeve at its portion of reduced cross section tapers gradually.
 4. A punch press according to claim 1, in which said sleeve has its portion of reduced cross section partially defined by a straight wall surface and partially by a round wall surface.
 5. A punch press according to claim 1, in which said sleeve has its portion of reduced cross section partially defined by two oppositely located straight wall surface portions and two oppositely located curved wall surface portions respectively located between said straight wall surface portions.
 6. A punch press according to claim 1, which includes a press head and also includes box nut means connecting said sleeve to said press head.
 7. A punch press according to claim 1, which includes a frame head and in which said frame section is formed by an arm vertically spaced from said frame head.
 8. A punch press according to claim 7, in which said sleeve at its portion of reduced cross section decreases in diameter in steps and in which said arm has a stepped surface section corresponding to the steps at the reduced diameter section of said sleeve.
 9. A punch press according to claim 7, in which said sleeve at its portion of reduced cross section tapers gradually, and in which sAid arm is provided with a surface section tapering in conformity with the taper of said reduced cross section.
 10. A punch press according to claim 7, which includes a matrix receiving portion, and in which the lower end of said arm extends near to said matrix receiving portion.
 11. A punch press according to claim 10, in which the distance between said arm and said matrix receiving portion approximately equals the thickness of the workpiece to be punched.
 12. A punch press according to claim 1, which includes a punch arranged within said sleeve and protruding from the lower end thereof by a distance approximately equalling the lifting stroke of said punch. 